Even after a year with the Skyla birth control I still bleeding during intercourse is that normal?

I've been on skyla for about a year and a half now and it's going great the only problem I have is that every time me and my boyfriend have sex I bleed like I'm on my period and I'm not and I know it says that that is normal but it's been going on for a year now is that normal what should I do? I'm really concerned! Help!